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Syngenta TopRes – Club Root Resistance

Clubroot is a widespread disease that causes serious problems in many Brassica growing areas. The disease is caused by a pathogen known as Plasmodiophora brassicae, a single-cellular organism. Symptoms of the disease include root malformations with hard swellings (clubs), that eventually rot. The disease also causes stunting through reduced growth, and the wilting of leaves due to the roots failing to function effectively.
Chemical control of the disease is not effective. Therefore, good genetic resistance of the crop is important for its protection against the disease.

Syngenta has developed a monogenetic dominant native trait which provides intermediate resistance to most races of clubroot (IR: Pb:0,1,3) for varieties of the Brassica oleracea species (including cauliflower, broccoli, cabbage, Brussels sprouts, and others). This resistance is known as TopRes™, and is currently available in a selection of cabbage, cauliflower and Brussels sprout varieties. Early trial work is currently being conducted in the broccoli crop and new hybrids with TopRes™ resistance are expected to be available for trial in the coming years. To identify which commercially available Syngenta varieties carry this resistance , just look for the TopRes™ symbol next to selected varieties in this crop guide.

Standard cabbage variety (left) versus Ramkila (Right) in Gippsland, Victoria

Syngenta – Integrated Clubroot Management in Vegetable Brassica Crops

Standard cabbage variety (left) versus Ramkila (Right) in Gippsland, Victoria

Standard cauliflower variety (left) versus Fiorino (Right) in Tasmania

TopRes broccoli trial in Club Root affected paddock in Gippsland, Victoria

Syngenta Club Root disclaimer

The Syngenta resistance against Club Root is effective against the predominant races Pb:0 and Pb:1 and against the less frequent race Pb:3 but not against the infrequent race Pb:2 that may occur in some fields .

Genetic resistance is only one of the tools to manage Club Root. Culture measures such as liming, use of fertilizers with high percentage of calcium, proper drainage, good crop hygiene management are several of important components of an integrated approach to manage the disease.

We always recommend to first execute small variety trials before starting commercial production of a new variety.

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    Fairbanks Seeds

    12/53 Gateway Boulevard
    Epping, Victoria, 3076. AUSTRALIA
    Ph: + 61 (03) 8401 3346
    Fax: +61 (03) 8401 3348
    [email protected]
    ABN 86 007 138 276

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